Headlamp washers do not come into the MOT test,  
  
The only reason that the headlights on JDM cars get swopped for traditional bulbs is for the SVA test , then they can get swopped back to the HID original items..and they will pass subsequent MOT tests 
  
For some crazy reason  Euro  law says HID headlights must have washers  (crazy, no where else has this law   )